:root {
  --ink: #181a18;
  --paper: #f4f0e7;
  --paper-deep: #e8e0d2;
  --red: #a02d28;
  --red-bright: #c2483f;
  --jade: #2f6154;
  --gold: #d4a44d;
  --line: rgba(24, 26, 24, 0.16);
  --serif: "Songti SC", STSong, SimSun, serif;
  --sans: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); }
button, input { font: inherit; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.topbar {
  position: fixed;
  z-index: 30;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 5vw, 76px);
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,.25);
  transition: background .25s ease, color .25s ease, box-shadow .25s ease;
}
.topbar.scrolled { color: var(--ink); background: rgba(244,240,231,.95); box-shadow: 0 8px 30px rgba(24,26,24,.08); backdrop-filter: blur(12px); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-family: var(--serif); font-weight: 700; }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; color: #fff; background: var(--red); border-radius: 2px; }
.desktop-nav { display: flex; gap: 36px; font-size: 14px; }
.desktop-nav a { position: relative; }
.desktop-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -7px; height: 2px; background: var(--red-bright); transition: right .2s ease; }
.desktop-nav a:hover::after { right: 0; }
.header-action { padding: 11px 16px; border: 1px solid currentColor; font-size: 13px; font-weight: 700; }

.hero { position: relative; min-height: min(760px, 92svh); overflow: hidden; color: #fff; }
.hero > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 40%; animation: hero-in 1.2s ease both; }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10,13,12,.76) 0%, rgba(10,13,12,.36) 48%, rgba(10,13,12,.04) 76%), linear-gradient(0deg, rgba(7,9,8,.55), transparent 45%); }
.hero-content { position: relative; z-index: 1; width: min(1180px, calc(100% - 40px)); min-height: min(760px, 92svh); margin: 0 auto; padding: 150px 0 74px; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; }
.eyebrow, .section-kicker { margin: 0 0 18px; font-size: 12px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; }
.hero h1 { margin: 0; font: 900 clamp(64px, 10vw, 142px)/.95 var(--serif); letter-spacing: 0; }
.hero-lead { width: min(540px, 100%); margin: 30px 0 26px; font: 600 clamp(18px, 2.3vw, 28px)/1.6 var(--serif); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-bottom: 32px; font-size: 14px; }
.hero-meta span::before { content: ""; display: inline-block; width: 5px; height: 5px; margin: 0 8px 2px 0; background: var(--gold); border-radius: 50%; }
.hero-cta { display: inline-flex; align-items: center; gap: 32px; padding: 14px 18px; color: var(--ink); background: #fff; font-size: 14px; font-weight: 700; transition: transform .2s, background .2s; }
.hero-cta:hover { transform: translateY(-2px); background: #f4ead6; }
.hero-caption { position: absolute; z-index: 1; right: clamp(20px, 5vw, 76px); bottom: 24px; margin: 0; font-size: 11px; opacity: .75; writing-mode: vertical-rl; }

.route-strip { display: grid; grid-template-columns: minmax(180px, .7fr) 2.3fr; gap: 60px; width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 64px 0; border-bottom: 1px solid var(--line); }
.route-intro h2, .section-heading h2, .booking-heading h2, .base-copy h2 { margin: 0; font: 700 clamp(32px, 4vw, 52px)/1.2 var(--serif); }
.section-kicker { color: var(--red); }
.route-list { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 0; margin: 0; padding: 0; list-style: none; }
.route-jump { width: 100%; min-height: 96px; padding: 0 18px; text-align: left; border: 0; border-left: 1px solid var(--line); color: var(--ink); background: transparent; cursor: pointer; }
.route-jump b { display: block; margin-bottom: 11px; color: var(--red); font-size: 13px; }
.route-jump span { display: block; font-family: var(--serif); font-size: 14px; font-weight: 700; line-height: 1.55; }
.route-jump.active, .route-jump:hover { background: var(--paper-deep); }

.itinerary-section { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 104px 0 120px; }
.section-heading { display: flex; justify-content: space-between; gap: 60px; align-items: end; margin-bottom: 52px; }
.section-heading > p { width: min(430px, 100%); margin: 0; color: #686b66; line-height: 1.8; }
.day-tabs { display: grid; grid-template-columns: repeat(5,1fr); margin-bottom: 36px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.day-tab { position: relative; min-height: 84px; padding: 16px; text-align: left; color: #6b6c68; background: none; border: 0; border-right: 1px solid var(--line); cursor: pointer; }
.day-tab:last-child { border-right: 0; }
.day-tab span { display: block; margin-bottom: 7px; font-weight: 700; }
.day-tab small { font-family: var(--serif); font-size: 13px; }
.day-tab::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -1px; height: 4px; background: var(--red); transition: right .25s; }
.day-tab.active { color: var(--ink); }
.day-tab.active::after { right: 0; }
.day-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: clamp(40px, 7vw, 96px); animation: panel-in .4s ease both; }
.day-panel[hidden] { display: none; }
.day-visual { position: relative; min-height: 620px; overflow: hidden; background: #d1c9ba; }
.day-visual img { width: 100%; height: 100%; object-fit: cover; }
.day-number { position: absolute; left: -8px; top: -32px; color: rgba(255,255,255,.82); font: 900 156px/1 var(--serif); }
.visual-label { position: absolute; right: 0; bottom: 0; min-width: 124px; padding: 16px 20px; color: #fff; background: var(--red); }
.visual-label span, .visual-label b { display: block; }
.visual-label span { margin-bottom: 4px; font-size: 10px; letter-spacing: .12em; }
.day-content { padding: 26px 0 10px; }
.day-theme { margin: 0 0 10px; color: var(--red); font-family: var(--serif); font-size: 14px; font-weight: 700; }
.day-content h3 { margin: 0 0 42px; font: 700 clamp(28px, 3vw, 42px)/1.25 var(--serif); }
.timeline { border-top: 1px solid var(--ink); }
.timeline article { display: grid; grid-template-columns: 82px 1fr; gap: 20px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.timeline time { color: var(--red); font-weight: 700; }
.timeline h4 { margin: 0 0 7px; font: 700 18px/1.4 var(--serif); }
.timeline p { margin: 0; color: #666963; font-size: 14px; line-height: 1.75; }
.tag { display: inline-block; margin: 12px 6px 0 0; padding: 6px 9px; color: var(--jade); background: rgba(47,97,84,.1); font-size: 11px; font-weight: 700; }
.tag.important { color: var(--red); background: rgba(160,45,40,.1); }
.day-note { margin-top: 28px; padding: 20px 22px; border-left: 3px solid var(--gold); background: #ebe4d7; }
.day-note b { font-family: var(--serif); }
.day-note p { margin: 7px 0 0; color: #61635f; font-size: 13px; line-height: 1.7; }
.day-note.dark { color: #fff; background: var(--jade); border-color: var(--gold); }
.day-note.dark p { color: rgba(255,255,255,.78); }

.booking-section { display: grid; grid-template-columns: minmax(260px,.75fr) minmax(420px,1.25fr); gap: clamp(48px, 8vw, 130px); padding: 110px max(20px, calc((100% - 1180px)/2)); color: #fff; background: #202723; }
.section-kicker.light { color: #e0b25a; }
.booking-heading h2 { max-width: 480px; }
.booking-heading > p:last-child { max-width: 410px; margin: 24px 0 0; color: rgba(255,255,255,.62); line-height: 1.8; }
.booking-list { border-top: 1px solid rgba(255,255,255,.35); }
.booking-list label { display: grid; grid-template-columns: 24px 1fr auto; gap: 16px; align-items: center; min-height: 92px; padding: 16px 0; border-bottom: 1px solid rgba(255,255,255,.13); cursor: pointer; }
.booking-list input { position: absolute; opacity: 0; pointer-events: none; }
.checkmark { width: 20px; height: 20px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.55); }
.booking-list input:checked + .checkmark { background: var(--gold); border-color: var(--gold); }
.booking-list input:checked + .checkmark::after { content: "✓"; color: #202723; font-weight: 900; }
.booking-list label:has(input:checked) b { text-decoration: line-through; color: rgba(255,255,255,.55); }
.booking-list b, .booking-list small { display: block; }
.booking-list b { margin-bottom: 7px; font-family: var(--serif); }
.booking-list small { color: rgba(255,255,255,.62); line-height: 1.65; }
.booking-list small strong { display: inline; color: #edbd63; font-family: var(--sans); }
.booking-list em { color: #edbd63; font-size: 11px; font-style: normal; }
.booking-progress { display: flex; align-items: center; gap: 20px; margin-top: 24px; font-size: 13px; }
.booking-progress > div { flex: 1; height: 3px; background: rgba(255,255,255,.18); }
.booking-progress i { display: block; width: 0; height: 100%; background: var(--gold); transition: width .3s ease; }

.base-section { display: grid; grid-template-columns: 1.2fr .8fr; gap: clamp(60px, 10vw, 150px); width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 112px 0; }
.base-copy > p:not(.section-kicker) { max-width: 620px; margin: 24px 0 48px; color: #5d605c; line-height: 1.8; }
.pace-line { display: flex; gap: 20px; align-items: end; height: 190px; padding-top: 14px; border-bottom: 1px solid var(--ink); }
.pace-line span { flex: 1; height: 100%; display: grid; grid-template-rows: auto 1fr auto; gap: 8px; align-items: end; }
.pace-line b { font-size: 12px; }
.pace-line i { width: 100%; height: var(--h); display: block; background: var(--red); transition: height .4s ease; }
.pace-line span:nth-child(2) i, .pace-line span:nth-child(3) i { background: var(--jade); }
.pace-line span:nth-child(4) i { background: var(--gold); }
.pace-line small { padding-bottom: 9px; color: #6c6d69; }
.packing { align-self: start; padding: 32px; border: 1px solid var(--ink); background: #eee8dc; scroll-margin-top: 92px; }
.packing h3 { margin: 0 0 25px; font: 700 30px/1.2 var(--serif); }
.packing ul { margin: 0; padding: 0; list-style: none; }
.packing li { display: flex; gap: 16px; padding: 16px 0; border-top: 1px solid var(--line); font-size: 14px; }
.packing li span { color: var(--red); font-size: 11px; font-weight: 700; }
.packing-tip { margin: 18px 0 0; padding: 12px 14px; color: #fff; background: var(--red); font: 700 14px var(--serif); }

footer { display: flex; justify-content: space-between; align-items: end; gap: 40px; padding: 48px max(20px, calc((100% - 1180px)/2)); color: rgba(255,255,255,.75); background: #171917; }
footer p { margin: 0; }
footer b, footer span { display: block; }
footer b { margin-bottom: 8px; color: #fff; font: 700 20px var(--serif); }
.credits { max-width: 430px; font-size: 12px; text-align: right; }
.credits summary { cursor: pointer; color: #fff; }
.credits p { margin-top: 12px; line-height: 1.8; }
.credits a { text-decoration: underline; text-underline-offset: 2px; }
.mobile-nav { display: none; }

@keyframes hero-in { from { opacity: .35; transform: scale(1.04); } to { opacity: 1; transform: scale(1); } }
@keyframes panel-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 820px) {
  body { padding-bottom: 66px; }
  .topbar { height: 60px; padding: 0 18px; }
  .desktop-nav, .header-action { display: none; }
  .hero { min-height: 86svh; }
  .hero > img { object-position: 62% center; }
  .hero-shade { background: linear-gradient(0deg, rgba(10,13,12,.82) 0%, rgba(10,13,12,.38) 70%, rgba(10,13,12,.25) 100%); }
  .hero-content { width: calc(100% - 36px); min-height: 86svh; justify-content: end; padding: 110px 0 60px; }
  .hero h1 { font-size: clamp(58px, 20vw, 86px); }
  .hero-lead { margin-top: 20px; font-size: 19px; }
  .hero-caption { right: 16px; bottom: 18px; }
  .route-strip { display: block; width: 100%; padding: 42px 0 0; }
  .route-intro { padding: 0 20px 28px; }
  .route-list { overflow-x: auto; grid-template-columns: repeat(5, 132px); scrollbar-width: none; }
  .route-jump { min-height: 102px; padding: 0 14px; }
  .route-jump span { font-size: 13px; line-height: 1.5; }
  .itinerary-section { width: 100%; padding: 72px 0 80px; }
  .section-heading { display: block; padding: 0 20px; margin-bottom: 34px; }
  .section-heading > p { margin-top: 18px; font-size: 14px; }
  .day-tabs { display: flex; overflow-x: auto; padding-left: 12px; scrollbar-width: none; }
  .day-tab { flex: 0 0 118px; }
  .day-panel { display: block; }
  .day-visual { min-height: 0; aspect-ratio: 4 / 3; }
  .day-number { font-size: 110px; }
  .day-content { padding: 32px 20px 0; }
  .day-content h3 { margin-bottom: 30px; }
  .timeline article { grid-template-columns: 64px 1fr; gap: 14px; }
  .booking-section { display: block; padding: 76px 20px; }
  .booking-heading { margin-bottom: 42px; }
  .booking-list label { min-height: 82px; }
  .base-section { display: block; width: calc(100% - 40px); padding: 78px 0; }
  .base-copy { margin-bottom: 64px; }
  .pace-line { gap: 10px; }
  .pace-line small { font-size: 10px; }
  .packing { padding: 24px; }
  footer { display: block; padding: 40px 20px; }
  .credits { margin-top: 26px; text-align: left; }
  .mobile-nav { position: fixed; z-index: 40; left: 0; right: 0; bottom: 0; height: 66px; display: grid; grid-template-columns: repeat(4,1fr); padding-bottom: env(safe-area-inset-bottom); background: rgba(249,246,239,.97); border-top: 1px solid var(--line); backdrop-filter: blur(12px); }
  .mobile-nav a { display: flex; flex-direction: column; gap: 3px; align-items: center; justify-content: center; color: #686a66; font-size: 10px; }
  .mobile-nav a span { font-size: 18px; line-height: 1; }
  .mobile-nav a.active { color: var(--red); font-weight: 700; }
}

@media (max-width: 420px) {
  .hero-meta { gap: 9px 14px; }
  .hero-cta { width: 100%; justify-content: space-between; }
  .route-intro h2, .section-heading h2, .booking-heading h2, .base-copy h2 { font-size: 34px; }
  .booking-list label { grid-template-columns: 22px 1fr; }
  .booking-list em { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}